Added step to add new failed queue job option to queue.php

upgrade.md

@@ -7,6 +7,7 @@
 - Replace `public/index.php`, `artisan.php`.
 - Add new `app/config/remote.php` file.
 - Add new `expire_on_close` option to `session` configuration file.
+- Add new `failed` queue job option to `queue` configuration file.
 - Remove call to `redirectIfTrailingSlash` in `bootstrap/start.php` file.
 - Edit `app/config/app.php`; 
   - in `aliases` change `'Controller' => 'Illuminate\Routing\Controllers\Controller',`